[kanapitsas]

Two touch-control additions for the iPhone, mainly for Half-Life 2.

Gyro aiming (runtime/ios/gyro_aim.c, CoreMotion in touch_controls.m)

• Turning the phone turns the camera, on top of the touch stick or trackpad: thumb for large turns, wrists to aim.
• Yaw follows the real vertical (works however the phone is tilted), pitch the screen's horizontal axis. Rotations under 0.05 rad/s are damped so a still phone does not drift.
• On by default in Half-Life 2, off in Portal 2 (each back tap would shake the camera). Settings: "Gyro aiming" and "Gyro speed" (×0.5 to ×2); P2_GYRO, P2_GYRO_SPEED, P2_GYRO_TIGHTEN.
• Sensors stop after 2 s outside play, at once when the app is left. Each sensor run has its own generation, so a sample still queued after a stop is dropped.

Quick load

• Holding quick save for half a second sends F9 (HL2's default "load quick") with a vibration; a short press still saves (F6). Keys are held 50 ms and two frames, like back taps. A cancelled touch or a menu opening mid-press does not save.

Tested: make check (165 Python tests, 245 C checks; new checks_gyro_aim.c covers both landscapes, the real-vertical yaw, damping and gaps), HL2 played on an iPhone 15 Pro Max: gyro aiming and quick load work. Reviewed by Codex (three findings, fixed). Not tested: Portal 2 with gyro aiming turned on.

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